You are correct, your INR doesn't reflect last night's missed dose, nor all of the missed dose from the night before. It generally takes 3 days for it to show up totally.
Did they have you resume the same dose?
What dose were you on when your INR was in range? Take a look at those doses and that's going to be close to what you need to be on now.
Where are you on getting a home testing machine? This will be extremely helpful until you find a doctor that knows how to manage Coumadin, because you can test "in secret" without letting the doctor know.
An INR taken tomorrow a.m. is going to truly reflect your missed dose on Fri. p.m. etc. So I'm hoping you don't go too low, or that they decreased your dose a whole lot. I'm guessing that your high INR had something to do with this hematoma/infection you have and how your body is reacting to the stress etc. But that's just a guess on my part based on what my body does.
Is there nothing they can do about the hematoma? Never had one myself, so I don't know. But it sounds painful!
Wish some of us lived close to you so we could meet for some in-person support!
Time for you to catch a break here!